量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Computed Tomography (CT) using X-ray attenuation by atomic effects has been used in various fields such as medical diagnosis. CT scanning of high density and high-Z industrial object using gamma-rays from radioisotopes, Bremsstrahlung gamma-rays in the MeV energy region, and quasi-monochromatic gamma-rays generated by laser Compton scattering (LCS) have been studied. However, even if such technologies are used, it is difficult to distinguish clearly a high-Z element from other high-Z elements by the atomic attenuation. Previous studies [4,5] have proposed a novel method to measure CT images for high density and high-Z objects using identification of a specific nuclide with Nuclear Resonance Fluorescence (NRF-CT). Here we show the demonstration of the isotope imaging with NRF-CT and a LCS gamma-ray beam. We measured a two-dimensional CT image of a lead isotope, 208Pb, inside a sample of an aluminum cylinder including an iron rod, a lead rod, and a hole (air). The preliminary NRF image includes both effects of atomic attenuation and nuclear resonant attenuation. By subtracting the atomic attenuation measured by a conventional method at the same time, a clear 208Pb isotope CT image was measured.
Demonstration of tomographic imaging of isotope distribution by nuclear resonance fluorescence
